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Im new to, how do I update my game? Do I just download these files and replace them with my current files? I'd like to avoid having to restart the entire game if possible as I was only having problems with the Heath ending

If you are using the app, then it should update automatically. Otherwise, simply downloading the files again and launching from there should be fine. Some older saves might not be compatible (but most of them should be if they aren't too old).